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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 114 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.67² =
  2. 2.88² =
  3. 3.41² =
  4. 4.36² =
  5. 5.93² =
  6. 6.33² =
  7. 7.61² =
  8. 8.64² =
  9. 9.89² =
  10. 10.72² =
  11. 11.75² =
  12. 12.87² =
  13. 13.42² =
  14. 14.74² =
  15. 15.37² =
  16. 16.69² =
  17. 17.49² =
  18. 18.54² =
  19. 19.94² =
  20. 20.38² =
  21. 21.77² =
  22. 22.32² =
  23. 23.71² =
  24. 24.58² =
  25. 25.63² =
  26. 26.98² =
  27. 27.91² =
  28. 28.39² =
  29. 29.82² =
  30. 30.81² =
  31. 31.51² =
  32. 32.96² =
  33. 33.86² =
  34. 34.43² =
  35. 35.55² =
  36. 36.95² =
  37. 37.52² =
  38. 38.44² =
  39. 39.76² =
  40. 40.35² =

Answer key

  1. 4489
  2. 7744
  3. 1681
  4. 1296
  5. 8649
  6. 1089
  7. 3721
  8. 4096
  9. 7921
  10. 5184
  11. 5625
  12. 7569
  13. 1764
  14. 5476
  15. 1369
  16. 4761
  17. 2401
  18. 2916
  19. 8836
  20. 1444
  21. 5929
  22. 1024
  23. 5041
  24. 3364
  25. 3969
  26. 9604
  27. 8281
  28. 1521
  29. 6724
  30. 6561
  31. 2601
  32. 9216
  33. 7396
  34. 1849
  35. 3025
  36. 9025
  37. 2704
  38. 1936
  39. 5776
  40. 1225

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